
#include <stdio.h>
#include <unistd.h>


int cnt = 0;

void C(void)
{
    int i = 0;
    while (1) {
        printf("Hello, cnt = %d, i = %d\n", cnt, i);
        cnt++;
        i = i + 2;
        sleep(5);
    }
}

void B(void)
{
    C();
}

void A(void)
{
    B();
}

int main(int argc, char **argv)
{
    A();
    
    return 0;
}


